Logical ReasoningDifficulty: Hard

PT140 S2 Q19 Explanation

Viewers surveyed immediately after

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsWeaken

Keep going in LSAT Lab

  • Save & drill this skill build targeted practice sets from questions like this one

  • Video walkthroughs watch every question solved step by step

  • 81 official LSATs as questions, timed sections & full-length tests

Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Viewers surveyed immediately after the televised political debate last year between Lopez and Tanner tended to think that Lopez had made the better arguments, but the survey respondents who reported that Lopez's arguments were better may have all, Lopez eventually did win the election.

What this question is testing

Weaken

Your task

Find the choice that makes the argument's conclusion less likely to be true.

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines it.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
19.

Which one of the following, if true, most seriously undermines

Answer choices

  1. No Impact20% picked this

    Most people who voted in the election that Lopez won did not

    The author wasn't selling us a story where "Lopez's debate performance was integral to her victory", and this answer would only be weakening that sort of claim. To the contrary, the author is saying "Lopez's debate performance probably meant very little, for her voters had already decided on her and because of that bias they rationalized that she had made the better arguments in the debate". Our author is assuming that most of the debate watchers were already Lopez voters, not that most of Lopez's voters were debate watchers.

  2. Strengthens, if anything8% picked this

    Most people in the live audience watching the debate who were surveyed immediately afterward said that they thought that Tanner was more persuasive

    If we were allowed to assume that the people who were in the live audience were undecided voters, and THEY thought that Tanner made the better arguments, that would strengthen the author's argument that people who said Lopez made better arguments were already biased in favor of her. Since we don't know anything about which type of people were in the live audience, it's really just unclear if this has any impact, but it's more likely to Strengthen than Weaken.

  3. Weaker Impact17% picked this

    The people who watched the televised debate were more likely to vote for Tanner than were the people who

    Since the author thinks that people saying Lopez won were biased, she is picturing people who already knew they were gonna vote for Lopez and then "saw what they wanted to see" in the debate. So saying, "Hey, author, most of the debate viewers were Tanner voters" seems to undercut that assumption. But ultimately if we compare the impact of this to that of (D), both answers are trying to convey that "the people watching the debate were NOT pro-Lopez", but this answer is talking about all people who watched the debate. Meanwhile (D) is specifically addressing the people in the survey, and the conclusion is specifically about survey respondents, so (D) more effectively attacks the idea that these survey respondents were pro-Lopez going into the debate.

  4. Correct51% picked this

    Most of the viewers surveyed immediately prior to the debate said that they would probably

    Why this is right

    This hurts the plausibility of the author's notion that the people who watched the debate were already biased in favor of Lopez. This answer essentially contradicts that assumption. When it comes to the viewers who were surveyed, they went into the debate preferring Tanner, biased in favor of Tanner. For them to then emerge from the debate and say, "I think Lopez's arguments were better" speaks highly of Lopez's debate performance. So this answer not only makes the author's story less plausible (how could they have been biased in favor of Lopez if they were mostly planning to vote for Tanner) but it also suggests an alternate explanation for the survey results: Lopez was impressive enough that even people who weren't planning to vote for her were admitting that she had made the better arguments.

    Skill tested: Weaken · how this choice captures the argument's function is the move to repeat next time.

  5. Too Weak3% picked this

    Lopez won the election over Tanner by a very

    This somewhat undermines the plausibility of the author's story that the debate viewers surveyed were biased in favor of Lopez. After all, in a 50/50 election, if the debate viewers surveyed were a representative sample of the electorate, then the debate viewers would be about evenly divided in terms of who was biased in favor of Lopez vs. in favor of Tanner. However, the survey results aren't a math mismatch for the results of the election. If the survey had been 4 to 1 in favor of Lopez winning the debate, whereas the election results were more like 49% vs. 48% in favor of Lopez, then it would be pretty implausible to say the 4 to 1 survey responses were because of a hugely slanted bias towards Lopez in the electorate. But all we know is that survey respondents tended to think Lopez made the better arguments, which just means "over 50% favored Lopez". A post-debate survey that narrowly tilts toward Lopez could be the result of a narrowly tilting bias in favor of Lopez, that results in a narrowly won election. Ultimately, we get to reject this answer by comparing its fuzzy impact to the clear, direct impact of the correct answer.

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free